docs: add issue templates

Author: brenocq

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐛 Bug report
+about: Create a bug report to help us improve ImPlot
+title: '[Bug] A brief, descriptive title'
+labels: type:fix, status:todo, prio:high
+assignees: brenocq
+---
+**Bug description**
+A clear and concise description of what the bug is.
+
+**Bug video/screenshot**
+Attach png/jpg/mp4/gif files if applicable to help explain your problem.
+
+**Code to reproduce the bug**
+```cpp
+void MyBug() {
+    // Minimal code snippet that reproduces the bug
+}
+```

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: ❓ Q&A
+    url: https://github.com/epezent/implot/discussions/categories/q-a
+    about: Have any questions or need help? Ask here!
+  - name: 📸 Gallery
+    url: https://github.com/epezent/implot/discussions/180
+    about: Share screenshots/videos of your projects using ImPlot!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: 🚀 Feature request
+about: Suggest an idea or enhancement for ImPlot
+title: '[Feature] A brief, descriptive title'
+labels: type:feat, status:idea, prio:medium
+---
+**Feature description**
+A clear and concise description of the new feature.
+
+**Feature videos/screenshots**
+Attach png/jpg/mp4/gif files if applicable to help explain your idea.